:root:not([customizing="true"]) #back-button[disabled="true"] {
  margin-left: var(--uc-toolbarbutton-hide-size) !important;
  opacity: 0 !important;
  pointer-events: none;
}

@include Animate {
  #back-button {
    transition-property: background-color, opacity, margin-left !important;
  }
  #back-button[disabled="true"] {
    transition: background-color 1s var(--animation-easing-function),
                opacity 1s var(--animation-easing-function),
                margin-left 0.5s ease !important;
  }
}
